JPH01176823U

JPH01176823U -

Info

Publication number: JPH01176823U
Application number: JP7194488U
Authority: JP
Priority date: 1988-05-31
Filing date: 1988-05-31
Publication date: 1989-12-18
Anticipated expiration: 2003-05-31
Also published as: JP2505405Y2

Description

[Brief explanation of the drawing]

第１図は本考案の１実施例に係るレンズ駆動機
構の断面図、第２図Ａ及び第２図Ｂは本考案の１
実施例に係るレンズ駆動機構の平面図、第３図は
第１図に示す機構中のカムリングと転子の関係を
示す図、第４図は第１図乃至第３図に示す機構に
おいてレンズ押さえ用のスプリングの付勢力とカ
ムリング回転用のスプリングの付勢力とステツプ
モータのトルクの関係を示す図、第５図は従来の
レンズ駆動機構の断面図、第６図は第５図に示す
機構におけるレンズ繰出し用のカム面の部分を示
す図、第７図は第５図及び第６図に示す機構にお
いてレンズ押さえ用のスプリングの付勢力とカム
リング回転用のスプリングの付勢力とステツプモ
ータのトルクの関係を示す図。１……カムリング、１ｄ……カム面、２……ス
テツプモータ、３……シヤツタ地板、７……レン
ズ外筒、８……撮影レンズ、８ａ……転子、９…
…前面板、１０……繰出しギア、１１……カムリ
ング回転用スプリング、２２……レンズ押さえ用
スイツチ、２３……中間レバー、２４……羽根駆
動レバー。 FIG. 1 is a sectional view of a lens drive mechanism according to an embodiment of the present invention, and FIGS. 2A and 2B are sectional views of a lens drive mechanism according to an embodiment of the present invention.
A plan view of the lens drive mechanism according to the embodiment, FIG. 3 is a diagram showing the relationship between the cam ring and the trochanter in the mechanism shown in FIG. 1, and FIG. 4 is a diagram showing the relationship between the cam ring and the trochanter in the mechanism shown in FIGS. Figure 5 is a sectional view of a conventional lens drive mechanism, and Figure 6 is a diagram showing the relationship between the biasing force of the spring for rotation of the cam ring, the biasing force of the spring for rotation of the cam ring, and the torque of the step motor. FIG. 7 is a diagram showing the cam surface for advancing the lens, and shows the biasing force of the spring for holding the lens, the biasing force of the spring for rotating the cam ring, and the torque of the step motor in the mechanism shown in FIGS. 5 and 6. Diagram showing relationships. DESCRIPTION OF SYMBOLS 1... Cam ring, 1d... Cam surface, 2... Step motor, 3... Shutter base plate, 7... Lens outer cylinder, 8... Taking lens, 8a... Trochanter, 9...
...Front plate, 10...Feeding gear, 11...Cam ring rotation spring, 22...Lens holding switch, 23...Intermediate lever, 24...Blade drive lever.

Claims

[Claims for Utility Model Registration] A cam ring on which a cam surface is formed is rotatably provided along the periphery of the aperture, a trochanter is provided on the outside of the photographic lens to abut the cam surface, and the trochanter is in contact with the cam surface. A spring for holding the lens is constantly biased so that the cam ring comes into contact with the lens, a spring for rotating the cam ring is constantly biased in the direction in which the photographing lens is extended, and the cam ring is rotated in conjunction with a motor capable of forward and reverse rotation to move the cam ring around the aperture. a rotating member that rotates along the rotational axis, and an engaging member that restricts the rotation of the cam ring in a direction in which the photographic lens is extended, and the cam ring is in focus in a first normal rotation region of the rotating member. The cam ring is rotated in a direction in which the photographing lens is extended by following the rotating member until the cam ring is stopped at the position, and the shutter blade is rotated in a second normal rotation area of the rotating member that is continuous with the first normal rotation area. The cam ring is configured to open and close, and when the rotating member is reversed to the initial position, the cam ring is reversed to the initial position via the engaging member, and the cam surface that the trochanter contacts is connected to the cam ring. A lens drive mechanism, characterized in that it is formed on the film surface side, and the biasing force of the lens holding spring is directed in the direction in which the photographic lens is fed out.